Tool-holder.



D. RICHARDS.

TOOL HOLDER.

' APPLICATION FILED SEPT-1, I917 1,295,600. Patented Feb.25,1919.

' 2 SHEETS-SHEET 1.

70.]. FIG. 2.

"AIAIIIIYI/il D. RICHARDS.

TOOL HOLDER APPLICATION FILED SEPT. I, 1917- 1,295,600. PatentedFeb.25,1919.

2 SHEETS-SHEET 2- ag, FIGJO.

Ill 5 is srs PATENT orrion DANIEL RICHARDS, or WINCHMORE HILL, ENGLAND,AssIdNoIt or ONE-HALF T0 DYs0N & COMPANY, (ENFIELD) LIMITED, or roNDEItsEND, ENGLAND.

TOOL-HOLDER.

To all whom it may concern:

Be it known that I, DANIEL RICHARDS, a subject of the King of GreatBritain and Ireland, residing at No. 99 Woodberry avenue, WinchmoreHill, in the county of MiddleseX, England, have invented certain new anduseful Improvements in and Connected with Tool-Holders, of which thefollowing is a specification.

This invention relates to improvements in and connected withtool-holders for lathes, planing machines and other machine tools, ofthe type in which the end of the shank is provided with a cutter-holdingpart, furnished with jaws and adapted to receive and retain the cutter,a locking roller or rollers mounted in a recess or recesses having aninclined surface or surfaces and guided at each end in a groove in thecutter-holding part and a spring for each roller, mounted in such amanner as to tend to force the roller toward the narrow end of eachrecess, for the purpose of causing such a roller to roll and lock thecutter in position. The object of the invention is to improve atool-holder of this kind, to prevent parts thereof from becomingdisplaced and lost and to insure that the cutter shall always be lockedin position, irrespective of the direction of travel of the tool or thework.

The invention comprises also various minor improvements which willappear in the following description and are defined in the claims,reference being had to the accompanying drawings, in which Figure 1 ofthe accompanying drawings is a front elevation of a tool holder with astraight shank and a cutter applied thereto;

Fig. 2 is a part sectional side elevation;

Fig. 3 is a plan section on the line III-III, Fig. 2.

Fig. 4 is an elevation of a locking roller to a larger scale;

Fig. 5 is an elevation ofa spring for pressing on a locking roller, and

Fig. 6 is a plan thereof.

Fig. 7 is an elevation of a modified construction of spring, and

Fig. 8 is a plan thereof.

Fig. 9 is a front elevation of a modified construction of tool holder. 7

Fig. 10 is a section thereof on the line XX Fig. 9, but without therollers springs and cutter.

Specification of Letters Patent.

Patented Feb. 25, 1919.

Application filed September 1, 1917. Serial No. 189,327.

thereof, a cutter-holding part b, recessed to form jaws 0 adapted toreceive and retain the tool or cutter d, which is of a cross section tocorrespond to the jaws of the cutter-holding part, and is furnished witha neck e and two lateral'projections f. At the rear of this ,recess,there is a block or abutment g, suitably held in place by having arojection h adapted to take into a recess between the jaws of thecutter-holding part and locked in position by two screws i. Or theabutment may be integral with the cuttter holding part b. .A transverseand tangential or Inclined recess or recesses 70, or preferably .threeof such recesses is or'are made in the block and within each of theserecesses is mounted a roller Z. Each jaw c of the cutter-holding partis, moreover, provided with a groove m, the ends of the rollers arereduced and these reduced ends I of the rollers are adapted to be guidedin these grooves. Each roller is pressed toward the shallower end of itsrecess by means of a bent spring a (Figs. 5 and 6) recessed or made likea fork 0 ateach end so as, in each case, to partially embrace the rollernear its ends. Preferably, however, and as shown in Figs. 7 and 8,double bow-shaped springs p are employed. The two upper and longer ends(I of the spring blank, Fig. 8, are shaped to fit within the grooves min the cutter-holding part and to abut against the wall or surface atthe deep end of the recess, while the two shorter ends are shaped toform forks 0' so as to partially embrace the roller 1. The two portions10 and p of the blank are connected at p and when folded on each otherbent and tempered, they are made to assume the form shown by Fig. 7.When the rollers and spring are in position as shown in the constructionshown in Figs. 2 and 3, the rollers tend to be parallel to the deep endsis of the recess '70 irrespective of their position therein andwhether-they are in engagement with the cutter d or whether the latterhas been removed from the holder. I

In the construction shown in Figs. 9 to 12,

the block orabutment g is, moreover, furnished with another inclinedrecess s, the rear surface-of Whichhas an angularity opposite to that ofthose just described, a

double bow spring p and a locking roller 0. In order to put this rollerout of action wh.en inserting or removing a cutter, the block isconveniently -provided-with a hole fat the top communicating with theinclined recess .9, for the insertion of a'pin, screw or thelike fordisplacing the roller 1*, when it is desired to remove the cutter-d fromthe "jaws c of the tool holder' and it isthen only necessary to knock orforce the cutter std upward whereupon the rollers Z come away fromintimate engagement with the rear ifaces of the recesses and the rearsurface of the cutter.

According to another construction the cutter-holding part is ihinge'd to-the shank and both the shank and'the cutter holding part are providedwith stops, so that when the tool is cutting, one stop on thecutterholding part is in contact with the corresponding stop on theshank. But if, as in a planing machine, the work is beingmoved past thecutter on the return stroke, the tool-holding partbeing hinged and therebeing a certain amount of play between the. otl1ertwo;stops,-the cuttingedge of the cutter is less deleteriouslyafiected than if, for example,[it had thewhole resistance due to the weight ofthe-tool box toovercome. In order, however, that the cutter shallalways'tend,to.resume,its proper posi- ,tion for cutting, a smallspringjs interposed and a suitable formIof-l-spring is a helical springmounted in a shallow hole in each of the stopsnfor determining theamount of movementto be allowed between the tool-holding part and (theshank during the return stroke.

Finally, in order to allow of'utilizing the tool-holder as a front or aside tool, the cutter in some cases being the same, the tool holdingpartiishingedto the ,shank and the pivotis provided with a nut and alock nut or the likegif desired. For the purpose, however, of preventingslipping between the two .parts',-,each is wholly or partiallyprovidedwith a circular rack on the surfacesitoybe engaged when 'theparts are clamped together. The nut then only requires'to beslackenedandthe tool-holding part is then partially rotated and screwed up inthepositionrequired.

'lVhat I -claim'is:-

1. Atool holder, fortlathes, planingmachines and other 7 machinertools,comprising in combination, a shank, a cutter --hol'ding part at one endof the, said shan-k, and having jaws to receive and retainacorrespondinglyfforme'd cutter'between them, a recess to'the rear ofandfbetween the said jaws andhaving its rear'surfa-ce angular to theplane in'which'the-rear surface of the cutter is situated, a groove ateach side of the cutter holding part, a locking roller having its endsfashioned to loosely engage in the saidgrooves,anbent spring, and meanson the latter whereby it partially embraces the roller in the vicinityof its ends.

2. A tool holder, for lathes, planing machines and other machine-tools,comprising in combination a shank, a correspondingly formed cutterholding part at one end of the said shank and having jaws to receive andretain a cutter between them, a plurality of recesses to the rear of andbetween the jaws and having their rear surfaces angular to the plane inwhich the rear surface of the cutter is situated, a groove, at each sideof the said-recesses, a locking roller for each recess, theends of saidlocking roller being adapted to loosely engage in the said grooves-and abent spring mountedin each recessso that its ends constantly press onthe rolleinnear its ends, the ends of the said spring being fork shapedso as to partially embrace the roller.

3. A tool holder, for lathes, planingmachines and other machine-tools,comprising, in combination a shank, a cutter holding part, atone end ofthe said shank and having jaws to receive andretain a.correspondinglyformed cutter between them, .a plurality of recesses to therear of andbe tween the said jaws, the said recesseshaving their rear surfacesangular to theiplane in which the rear surface of the cutter issituated, a groove at: each sideofthe said recesses, a locking rollerineach,recess the ends of saidrollers adapted to 1008613 061 gage in thesaid grooves, and aldoubleibowspring mounted ineach recess, two of theends of the said spring being fork-shaped so asto partially embrace-theroller in the said recess.

i. A tool holder, for lathes,planingvmachines and other machine-tools,comprising, in combination, .a shank, a cutter holding part, at one endofthe said shank and having jaws to receive and retain a correspondingly formed cutter between them,ca .plurality of recesses to the rearof and '.between the said jaws,.the said recesses having their rearsurfaces angular to the plane in which therearsurface ofthe cutter issituated, a groove at each sideofthe-said recesses, alocking rollerineach recess the ends of said rollers adapted to loosely -engage in thesaid grooves, and a; double bowspring mounted in each recess, the endsof one bow portion of the said spring being fork-shaped so as topartially embrace'the roller in the said recess and the ends of;theother bow portion adapted to loosely engage in a the said grooves. w

'5. A tool holder, for lathes, planing machines and other machine tools,comprising,

in combination, a shank, a cutter holding part at one end of the saidshank and having jaws to receive and retain a cutter between them, aplurality of recesses to the rear of and between the said jaws, the saidrecesses having their rear surfaces angular to the plane in which therear surface of the cutter is situated, a groove at each side of thesaid recesses, a locking roller for each recess, the ends of saidlocking rollers adapted to engage in the said grooves, a doublebowspring mounted in each recess, the ends of one bow-portion of thesaid spring being fork-shaped so as to partially embrace the roller inthe said recess, the ends of the other bow portion adapted to looselyengage in the said grooves, another recess having its rear surfaceangular to the plane in which the rear surface of the cutter is situatedand of an inclination opposite to that of the aforesaid recesses, alocking roller in the said recess, the ends of said locking rolleradapted to engage in the aforesaid grooves, a bent spring, fork shapedat its ends and partially embracing the said roller near its ends andmeans for displacing the roller to admit of the renewal of the cutter.

6. A tool holder for lathes, planing machines and other machine tools,comprising, in combination, a shank, a cutter holding part at one end ofthe said shank and having laterally recessed jaws to receive and retaina cutter having an engaging part of corresponding cross-section, anabutment block adapted to be fixed between the said jaws, means forfixing the said abutment block, a plurality of recesses in the saidblock the rear surfaces of the said recesses being angular to the frontsurface of the said block, a'

groove in each jaw, a locking roller for each recess, the ends of saidlocking roller being adapted to loosely engage in the said grooves and abent spring mounted in each recess, so that its ends constantly press onthe roller near its ends, the ends of the said spring being fork-shapedso as to partially embrace the roller.

7. A tool holder, for lathes, planing machines and other machine tools,comprising, in combination, a shank, a cutter holding part at one end ofthe said shank and having laterally recessed jaws to receive and retaina cutter having an engaging part of corresponding cross section, anabutment block adapted to be fixed between the said jaws, means forfixing the said abutment block, a plurality of recesses in the saidblock, the rear surfaces of the said recesses being angular to the frontsurface of the said block, a groove in each jaw, a locking roller ineach recess, the ends of said rollers adapted to loosely engage in thesaid grooves and a double bow-spring mounted in each recess, two of theends of the said spring being fork-shaped so as to partially engage theroller in the said recess.

'-8. A tool holder, for lathes, planing machines and other machinetools, comprising in combination, a shank, a cutter holding part at oneend of the said shank and having laterally recessed jaws to receive andretain a cutter having an engaging part of corresponding cross section,an abutment block adapted to be fixed between the said jaws, means forfixing the said abutment block, a plurality of recesses in the saidblock, the rear surfaces of the said recesses being angular to the frontsurface of the block, a groove in each jaw, a locking roller in eachrecess, the ends of said rollers adapted to loosely engage in the saidgrooves and a double bow-spring mounted in each recess the ends of onebow-portion of the said spring being fork-shaped, so as to partiallyembrace the roller in the said recess and the ends of the otherbow-portion, adapted to loosely engage in the said grooves.

9. A tool holder for lathes, planing machines and other machine tools,comprising, in combination, a shank, a cutter-holding part at one end ofthe said shank and having laterally recessed jaws to receive and retaina cutter having an engaging part of corresponding cross section, anabutment block adapted to be fixed between the said jaws, means forfixing the said abutment block, a plurality of recesses in the saidblock, the rear surfaces of the said re cesses being angular to thefront surface of the block, another recess having its rear surfaceangular to the front surface of the block but of an angularity oppositeto that of the aforesaid recesses, a groove in each jaw, a lockingroller in each recess, the ends of said rollers adapted to looselyengage in the said grooves, a double bow spring mounted in each recessthe ends of one bow-portion of each of the said springs beingfork-shaped, so as to partially embrace the roller in the said recess,and the ends of the other bow-portion adapted to loosely engage in thesaid grooves and means for displacing that roller which is mounted inthe recess having its rear surface of opposite angularity to that of theaforesaid plurality of recesses.

10. A tool holder, for lathes, planing machines and other machine tools,comprising in combination a shank, a cutter-holding part at one end ofthe said shank and having laterally recessed jaws to receive and retaina cutter having an engaging part of corresponding cross section, arecess at the top, to the rear of and between the said jaws, an abutmentblock adapted to fit between the said jaws and having a projection toengage in the said recess, means for rigidly retaining the said abutmentblock in place, a plurality oftrsnsversere oesses in the said block, therear surfaces of the said recesses'being angular to the front surface ofthe block the upper recess having its rear surfaceofuan engularityopposite to that of the other recesses, a vertical groove in each jawintersecting the said recess, a locking roller inueach recess, theendsof said rollersadepte d to loosely engage inithe said grooves, adouble borW spring mounted in each recess, the ends of one bow portionof each ofthesaid springs being fork-shaped, so ts to partially embracethe roller in the said recess, and the ends of the other bowportion,edapted to loosely. engage in the said grooves and a hole through,thettop of the block into. the uppermost recess for the insertion .ofan instrumentto displace the said upper} roller.

11. In a tool holder, 01 lathies planing .ma-e11i.11e-.end o her ma nolsth emb n tion Wit h nk, e cu terho din pe at one end th sa d shank enha ing jaws to recelve and retaln a cutter hay ng v..en gegx 1 g p o avmos sectio o r sponding to that of the sa d aWs, vaplurahtyoftrensyerserecesses at the rear of the said jaws thereal-surfaces ofithe said recesses being angular tothe rear surfaceofithe cutter aroller v n each of sa d recesses and the ends ofthe saidrollers adapt- ,ed-to-freelyengage in the said grooves, of a doublebowsspring in each of-,the seidre- DANIEL RICHARDS.

Copies of this patent may be obtained for five cents eaqh,-l3yaddressing the Gomm issioner of Patents, .Washjngtpn, D. ,0.

